Perhaps you should try some spelling variations:
hinh thai » sinh thai, tinh thai, dinh thi
thai cua » than cua, tai cuc, tri cua
dang xa » dang xay, dang ha, dang va
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
duc van » duc tan, duc manh, duc phan
cua tre » cua te, cuu tre, cua triet
su sai » su tai, su hai, su dai
sai ky » sac ky
ve cam » ve cham, ve cac, va cam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky ((dang xa) or (lang xa)) hoi. hieu ve cam ((duc van) OR (duc va)) hinh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky ((dang xa) OR (lang xa)) hoi. hieu ve cam ((duc van) OR (duc va)) hinh thai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky ((dang xa) or (lang xa)) hoi. hieu ve cam ((duc van) OR (duc va)) hinh thai cua tre*".